Electric motor having three-layer winding structure

a technology of winding structure and electric motor, which is applied in the direction of dynamo-electric machines, electrical apparatus, magnetic circuit shapes/forms/constructions, etc., can solve the problems of reducing torque and increasing the number of process steps in manufacture, and achieve the effect of keeping the torque sufficiently high and reducing the torque rippl

Active Publication Date: 2016-07-28
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]An object of the present invention is to provide an electric motor having a winding arran

Problems solved by technology

However, such modifications to electric motors require that the electric motors have more complicated structures, causing an increase in the number of process steps in manufactu

Method used

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  • Electric motor having three-layer winding structure
  • Electric motor having three-layer winding structure
  • Electric motor having three-layer winding structure

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Embodiment Construction

[0022]A three-phase alternating current electric motor according to the present invention will be described below with reference to the drawings. FIG. 1 is the sectional view of a ten-pole thirty-six-slot electric motor. In FIG. 1, reference numeral 6 indicates a stator, and reference numeral 10 indicates a rotor. The rotor 10 includes ten magnets 11, a rotor core 12, and a rotor shaft 13. The rotor 10 rotates about a rotation axis C of the rotor. The number of magnetic poles is ten, which is the same number as the magnets. The stator 6 includes a stator core 3, thirty-six slots 2 formed in the direction of the rotation axis C and arranged in a circumferential direction of the rotor, and windings disposed in each slot 2, as described later. Since the present invention relates to the arrangement of the windings wound in the stator core 3 of the electric motor, the description of the rotor will be omitted below. FIG. 2 is the developed sectional view of a two-layer winding arrangement...

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PUM

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Abstract

In a three-phase AC electric motor, in each slot, any or some of the windings of six phases in total, including three phases of U, V, and W phases and opposite phases thereof, are arranged in three layers per slot. As the windings in first layers, of the three-layer windings, U, V, and W-phase windings are arranged so as to have rotational symmetry with one another at a mechanical angle of ±120 degrees. The windings in second layers have the same arrangement as in the first layers shifted by L slots, and the windings in third layers have the same arrangement as in the first layers shifted by L slots in a direction opposite to the arrangement of the windings in the second layers.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an electric motor, and more specifically relates to an electric motor having a structure in which three-layer windings are arranged in slots of a stator.[0003]2. Description of Related Art[0004]To reduce torque ripple, optimizations have been conventionally performed on the forms of rotor cores, the forms of stator cores, the skews of the rotor cores, the skews of the stator cores, and the like.[0005]However, such modifications to electric motors require that the electric motors have more complicated structures, causing an increase in the number of process steps in manufacture.[0006]Also, in the electric motors, the magnitude of the torque ripple is affected by the number of poles, the number of slots, and the winding arrangement of windings.[0007]As a combination of the pole number and the slot number that serves to reduce the torque ripple, there is a fractional slot electric motor in ...

Claims

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Application Information

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IPC IPC(8): H02K3/28H02K1/16H02K3/12
CPCH02K3/28H02K1/165H02K3/12H02K1/16H02K2213/03
Inventor ITO, TAKASHI
Owner FANUC LTD
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